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阅读下面的文言文，完成4—7题。 臧宫字君翁，颍川郏人也。因从光武征战，诸将多称其勇。光武察官勤力少言，甚亲纳之。十一年，将兵至中卢，屯骆越。是时公孙述将田戎、任满与征南大将军岑彭相拒于荆门。彭等战数不利，越人谋畔从蜀。官兵少，力不能制。会属县送委输车数百乘至，宫夜使锯断城门限。令车声回转出入至旦。越人候伺者闻车声不绝，而门限断，相告以汉兵大至。其渠帅乃奉牛酒以劳军营。宫陈兵大会，击牛龋酒，飨赐慰纳之．越人由是遂安。宫以谨信质朴，故常见任用。二十七年，宫乃与杨虚侯马武上书日：“匈奴贪利，无有礼信。穷则稽首，安则侵盗，缘边被其毒痛，中国忧其抵突。虏今人畜疫死，旱杀菇蟊赢不当中国一郡。万里死命，县在陛下。福不再来，时或易失，岂宜固守文德而堕武事乎?今命将临塞，厚县购赏，喻告高句骊、鸟桓、鲜卑攻其左，发河西四郡、天水、陇西羌胡击其右。如此虏之灭，不过数年。臣恐陛下仁恩不忍，谋臣狐疑，令万世刻石之功不立于圣世。，’诏报日：“《黄石公记》日，‘柔能制刚，弱能制强’。柔者德也，刚者贼也，弱者仁之助也，强者怨之归也。故日有德之君，以所乐乐人；无德之君，以所乐乐身。乐人者其乐长，乐身者不久而亡，舍近谋远者，劳而无功；舍远谋近者。逸而有终。逸政多忠臣，劳政多乱人。故曰务广地者荒，务广德者强。有其有者安，贪人有者残。残灭之政，虽成必败。今国无善政，灾变不息，百姓惊惶，人不自保，而复欲远事边外乎?孔子曰：“吾恐季孙之忧，不在颛臾。且北狄尚强，而屯田警备传闻之事，恒多失实。诚能举天下之半以灭大寇，岂非至愿；苟非其时，不如息人。”自是诸将莫敢言兵事者。（《后汉书·列传第八》）

There are stories about two U ． S . presidents ， Andrew Jackson and Martin Van Buren ， which attempt to explain the American English term OK ． We don’t know if either story is true ， but they are both interesting ． The first explanation is based on the fact that President Jackson had very little education ． In fact ， he had difficulty reading and writing ． When important papers came to Jackson ， he tried to read them and then had his assistants explain what they said ． If he approved of a paper ． he would write“all correct”on it ． The problem was that he didn’t know how to spell ． So what he really wrote was“ol korekt” ． After a while ， he shortened that term to“OK” ． The second explanation is based on the place where President Van Buren was born ， Kinderhook ， New York ． Van Bnren’s friends organized a club to help him become President They caned the club the Old Kinderhook Club ， and anyone who supported Van Buren was called“OK” ．